Updating sounding reference signal spatial relation information

Abstract

Apparatuses, methods, and systems are disclosed for updating SRS spatial relation information. One method includes transmitting first information indicating SRS spatial relation information for an SRS resource. The SRS spatial relation information includes: SRS spatial relation information identifiers; and an SRS spatial relation information reference signal corresponding to each SRS spatial relation information identifier. The method includes transmitting second information indicating an update to the SRS spatial relation information. The second information includes: a serving cell identifier; a bandwidth part identifier; one or more SRS resource identifiers, one or more SRS resource set identifiers, or a combination thereof; and one or more SRS spatial relation information identifiers. Each of the one or more SRS resource identifiers corresponds to each of the one or more SRS spatial relation information identifiers.

The invention claimed is: 
     
       1. A method performed by a base station, the method comprising:
 transmitting first information indicating sounding reference signal (SRS) spatial relation information for a SRS resource, wherein the SRS spatial relation information comprises:
 a plurality of SRS spatial relation information identifiers; and 
 a SRS spatial relation information reference signal corresponding to each SRS spatial relation information identifier of the plurality of SRS spatial relation information identifiers; 
 
 transmitting second information indicating an update to the SRS spatial relation information of the SRS resource, wherein the second information comprises:
 a serving cell identifier; 
 a bandwidth part identifier; 
 one or more SRS resource identifiers, one or more SRS resource set identifiers, or a combination thereof; and 
 one or more SRS spatial relation information identifiers of the plurality of SRS spatial relation information identifiers, wherein each of the one or more SRS resource identifiers corresponds to each of the one or more SRS spatial relation information identifiers; and 
 
 transmitting third information indicating one or more simultaneous spatial relation cell lists for updating the SRS spatial relation information using radio resource control (RRC) signaling. 
 
     
     
       2. A base station, comprising:
 at least one memory; and 
 at least one processor coupled with the at least one memory and configured to cause the base station to:
 transmit first information indicating sounding reference signal (SRS) spatial relation information for a SRS resource, wherein the SRS spatial relation information comprises: 
 a plurality of SRS spatial relation information identifiers; and 
 a SRS relation information reference signal corresponding to each SRS spatial relation information identifier of the plurality of SRS spatial relation information identifiers; 
 transmit second information indicating an update to the SRS spatial relation information of the SRS resource, wherein the second information comprises:
 a serving cell identifier; 
 a bandwidth part identifier; 
 one or more SRS resource identifiers, one or more SRS resource set identifiers, or a combination thereof; and 
 one or more SRS spatial relation information identifiers of the plurality of SRS spatial relation information identifiers, wherein each of the one or more SRS resource identifiers corresponds to each of the one or more SRS spatial relation information identifiers; and 
 
 transmit third information indicating one or more simultaneous spatial relation cell lists for updating the SRS spatial relation information using radio resource control (RRC) signaling. 
 
 
     
     
       3. The base station apparatus of  claim 2 , wherein the first information is transmitted using the RRC signaling. 
     
     
       4. The base station of  claim 2 , wherein the second information is transmitted using a medium access control control element (MAC CE). 
     
     
       5. The base station of  claim 2 , wherein the SRS resource is either aperiodic or semi-persistent. 
     
     
       6. The base station of  claim 2 , wherein the second information comprises the one or more SRS resource set identifiers, and each of the one or more SRS resource set identifiers corresponds to each of the one or more SRS spatial relation information identifiers. 
     
     
       7. The base station of  claim 6 , wherein the one or more SRS resource set identifiers comprises a bitmap, and each bit of the bitmap corresponds to a SRS resource set identifier of the one or more SRS resource set identifiers. 
     
     
       8. The base station of  claim 2 , wherein the second information comprises the one or more SRS resource identifiers, the one or more SRS resource identifiers comprises a bitmap, and each bit of the bitmap corresponds to a SRS resource identifier of the one or more SRS resource identifiers. 
     
     
       9. The base station of  claim 2 , wherein the at least one processor is configured to cause the base station to transmit fourth information indicating a SRS resource set, and each SRS resource in the SRS resource set has the same SRS spatial relation information. 
     
     
       10. The base station of  claim 9 , wherein the SRS resource set is for noncodebook usage. 
     
     
       11. A user equipment (UE), comprising:
 at least one memory; and 
 at least one processor coupled with the at least one memory and configured to cause the UE to:
 receive first information indicating sounding reference signal (SRS) spatial relation information for a SRS resource, wherein the SRS spatial relation information comprises:
 a plurality of SRS spatial relation information identifiers; and 
 a SRS spatial relation information reference signal corresponding to each SRS spatial relation information identifier of the plurality of SRS spatial relation information identifiers; 
 
 receive second information indicating an update to the SRS spatial relation information of the SRS resource, wherein the second information comprises:
 a serving cell identifier; 
 a bandwidth part identifier; 
 one or more SRS resource identifiers, one or more SRS resource set identifiers, or a combination thereof; and 
 one or more SRS spatial relation information identifiers of the plurality of SRS spatial relation information identifiers, wherein each of the one or more SRS resource identifiers corresponds to each of the one or more SRS spatial relation information identifiers; and 
 
 receive third information indicating one or more simultaneous spatial relation cell lists for updating the SRS spatial relation information using radio resource control (RRC) signaling. 
 
 
     
     
       12. The UE of  claim 11 , wherein the first information is received using the RRC signaling. 
     
     
       13. The UE of  claim 11 , wherein the second information is received using a medium access control control element (MAC CE). 
     
     
       14. The UE of  claim 11 , wherein the SRS resource is either aperiodic or semi-persistent. 
     
     
       15. The UE of  claim 11 , wherein the at least one processor is configured to cause the UE to, in response to receiving the second information and the third information, update each component carrier in a simultaneous spatial relation cell list of the one or more simultaneous spatial relation cell lists based on the second information. 
     
     
       16. The UE of  claim 11 , wherein the second information comprises the one or more SRS resource set identifiers, and each of the one or more SRS resource set identifiers corresponds to each of the one or more SRS spatial relation information identifiers. 
     
     
       17. The UE of  claim 16 , wherein the one or more SRS resource set identifiers comprises a bitmap, and each bit of the bitmap corresponds to a SRS resource set identifier of the one or more SRS resource set identifiers. 
     
     
       18. The UE of  claim 11 , wherein the second information comprises the one or more SRS resource identifiers, the one or more SRS resource identifiers comprises a bitmap, and each bit of the bitmap corresponds to a SRS resource identifier of the one or more SRS resource identifiers. 
     
     
       19. A processor for wireless communication, comprising:
 at least one controller coupled with at least one memory and configured to cause the processor to:
 receive first information indicating sounding reference signal (SRS) spatial relation information for a SRS resource, wherein the SRS spatial relation information comprises:
 a plurality of SRS spatial relation information identifiers; and 
 a SRS spatial relation information reference signal corresponding to each SRS spatial relation information identifier of the plurality of SRS spatial relation information identifiers; 
 
 receive second information indicating an update to the SRS spatial relation information of the SRS resource, wherein the second information comprises:
 a serving cell identifier; 
 a bandwidth part identifier; 
 one or more SRS resource identifiers, one or more SRS resource set identifiers, or a combination thereof, and 
 one or more SRS spatial relation information identifiers of the plurality of SRS spatial relation information identifiers, wherein each of the one or more SRS resource identifiers corresponds to each of the one or more SRS spatial relation information identifiers; and 
 
 receive third information indicating one or more simultaneous spatial relation cell lists for updating the SRS spatial relation information using radio resource control (RRC) signaling. 
 
 
     
     
       20. The processor of  claim 19 , wherein the first information is received using the RRC signaling.